Improvement in breastplw-tongues



u NI'IED ATENT CFFIOE.

IMPROVEMENT IN BREASTPIN-TONGUES.

Specification forming part of Letters Patent No. 137,154, dated March 25, 1873.

To all whom it may concern:

Be itknown that I, LEWIS H. SoNDHErM, of the city, county, and State of New York, have invented a new and useful Improvement in Breastpin-Tongues, of which the following is a specification:

The object of this invention is to improve the present mode of making what are known as the tongues of breastpins. are manufactured and sold to jewelers as an article of commerce distinct from the breastpin proper.

The usual mode has been to use either hard or soft solder, or both, to fasten the parts together. In such light and delicate work the flame for melting the solder unavoidably heats and softens the pin, if it does not burn and render it brittle at the part of the pin which (more than any other) is relied upon for strength and durability.

My invention consists in connecting the parts of the tongue together by means of screw-threads, by which the pin is made detachable, and its full strength secured.

In the accompanying drawing, Figure 1 is a back view. Fig. 2 is a longitudinal section.

Similar letters of reference indicate corresponding parts.

The breastpin-tongue consists of two piecesthe pin proper a, and the plate or hinge socket piece b, the latter 'havin g an eye, 0, by which it is jointed to the inner. side of the breastpin by a pintle-pin. A screw-thread is out upon the butt end of the pin a to fit the hingesocket, and the two parts are screwed together, as seen in Fig. 2, the screw-thread of the pin cutting athread for itself in the said hinge-socket. N 0 heat is required in thus con- These tongues necting the pin, and the parts may be sepa rated at any time by unscrewing, if desired.

This latter feature is not so essential as to avoid the use of heat, although it is convenient to have the pin detachable. This mode of fastening avoids the use of solder or heat, and is an effectual fastening.

The tongue portion is of course made preferably of hard metal, while, on the contrary, that of the hinge-socket is comparatively soft. The joints of these tongues and hinge-sockets have heretofore been attached either by hard soldering applied directly to the tongue, (in which case the tongue is entirely softened by the heat,) or by hard soldering applied to a hinge-socket, and then soft soldering applied to the tongue in the hingesocket, in which case the tongue is not only partially softened, but will invariably loosen and come out of the hinge-socket after little wear. This has been a source of great annoyance to jewelers, and my invention overcomes the difficulty.

Having thus described myinvention, I claim as new and desire to secure by Letters Patent As an article of manufacture, a breastpintongue consisting of the stem c and hingesocket b, said stein being made of harder material than the socket, and provided with a threaded end that makes a corresponding thread in the socket, as and for the purpose described.

LEWIS H. SONDHEIM.

Witnesses:

JAMES T. GRAHAM, T. B. Mosnnn. 

